Tool-holder.



G.AMBORN.

TOOL HOLDER.

APPLICATION FILED JAN. 4.1.913.

Patented Jan. 25, 1916.

INVENTOR WITNESSES:

By A Ztorneys, L/%Wfl/m 'insirnn srarns earsnr onnrcn GEORGE AltIBORN,OF CHAIPINVILLE, CONNECTICUT, ASSIGNGR TO J. H. WILLIAMS & (30., OFBROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

TOOL-HOLDER.

Specification of Letters Patent.

Patented J an. 25, 1916.

Application filed January 4, 1913. Serial No. 740,102.

To all whom it may concern:

Beit known that I, Gnonon AMBORN, a citizen of the United States,residing in Chapinville, in the county of Litchfield and State ofConnecticut, have invented certain new and useful Improvements inTool-Holders, of which the following is a specification.

This invention aims to provide certain improvements in lathe toolholders. The holder is particularly adapted for special cutters or toolsand is provided with one or more shoulders for supporting the head ofsuch a cutter while the shank thereof is clamped in a suitable openingin the head of the holder. An improved clamping means for the toolholders is provided in the form of a cam member of special design andmounted in very simple way in the head of the holder.

Figure l is a plan; Fig. 2 an end elevation, and Figs. 3 and 4:longitudinal and cross-sections respectively of one type of tool holder.Figs. 5, 6 and 7 are respectively a plan, side elevation and endelevation of another style. Fig. 8 is a vertical cross-section of aholder showing a modified style of cam member of the same general classas in the other figures (this figure being taken from my priorapplication No. 684,980 filed March 20, 1912).

Referring to the embodiments of the invention illustrated, and first toFigs. 1 to 4, the tool holder A has a head B with an opening C thereinextending approximately longitudinally, With its outer end slightlyelevated. The lower part of the head 13 projects forward to form ashoulder which supports the head of the tool. A cam D, arranged in thehead rotates on an axis transverse thereto and serves to clamp the shankE of the tool in the opening C. The outer end of the head is cut away atthe top so as to form shoulders F on opposite sides of the open groove Gwhich is formed by extending the lower part of the opening C.

A holder of this style is adapted to take either right-handed orleft-handed special cutters or tools, and can also take straight,regular cutters of the ordinary stock designs. The holder is showncarrying a special lefthanded cutter having a shank E which fits theopening C. The head F of the tool has its lower part fitting in thegroove G which constitutes an extension of the longitudinal opening C;the head having a laterally-oifset portion H which bears upon theshoulder F.

The cam D is formed on its ends with a pair of bearing rings J and Kjournaled in the head of the holder near its opposite side faces, thecam being held in place by means of a wire L fitting in half-roundgrooves in the bearing K and the head B respectively.

The design of Figs. 5, 6 and 7 shows a holder A" the head M of which hasa longitudinal opening N which, iowever, is open to one of the sidefaces of the holder, as indicated in Fig. 7. The cam D is the same as inthe previous figures. This holder may be made either right-handed orleft-handed, out not both, the design shown being righthanded. The shankE of the tool is clamped in the groove N by means of the cam D while thehead 0 of the tool bears upon the shoulder P formed by extending thelower partof the head of the holder. The back face of the tool is alsosupported by the side portion Q of the head of the tool which isextended to form a shoulder as shown in Fig. 5.

The cam may be fastened as shown in Fig. by means of a single wire ringL. or a ring of this sort may be used near each end of the cam member.Or, as shown in Fig. 8, the cam D may be provided with a flange Rbearing against one face of the holder, the opposite end of the memberprojecting slightly through the head B of the holder and being held by awire ring S in a groovein the cam member. A squared or otherwisenon-circular head T may be provided for turning tl e cam where there isno objection to the existence of such a projection upon the side of theholder. I prefer, how ever, to have the two ends of the membersubstantially flush with (or depressed below) the side faces of theholder so as to avoid any substantial projections. A substantially flushconstruction is shown at both ends of the cam member in Fig. 4. The camis turned by a polygonal socket T which passes clear through from end toend of the cam member as in Fig. 4, or a polygonal socket T (Fig. 8)which passes only part way through the cam member. In the preferredconstruction the socket passes entirely through the member, and may beslightly flared at the ends so that the tool may be easily introducedand will come to a bearing (in turning the cam) first upon points of themember which are between its supporting bearing ends. The fact that thewrench bears upon the cam member between the bearing ends J and K of thecam member increases the durability of the latter in good condition,diminishes the wear on the socket, and makes it easier to bring the camto a good clampmg action on the shank of the tool. By running the socketentirely throughand making the mouth of the socket bell-shaped thestrain willcome morein the center of the cam, and will thus preventcracking or checking when hardened.

Nhat I claim is l. A tool-holder having a one-piece head with an openingtherein extending longitudinally and adapted to embrace the shank ofwith an opening therein extending longitudinally and adapted to receivethe shank of a tool, the sides of said head projecting forward'beyondthe upper part and forming horizontal shoulders on opposite sides ofsaid opening to form supports for the laterally projecting heads of bothright-handed 'and'left-ha'nded tools, and means bearing directly on theshank of the tool for clamping the tool in place.

3.-A tool holder having'a one-piece head B with an opening C thereinextending longitudinally and adapted to receive the shank of-a tool,the-lower part of said head projectingforward and forming horizontalshouldersF at opposite sides of the head of the tool'in planes above thebottom of said opemng, and a cam D extendlng horlzontally through thehead of said holder and serving to clamp said tool in place.

5. A tool holder provided with clamping means comprising a cam memberextending entirely through the holder, and having a polygonal socketextending entirely throughsuch cam member, so as to be accessible at themiddle of the axial length of the cam and from both sides of the holder.

6. A tool holder provided with clamping means comprising a cam memberextending entirely through the holder, and having a polygonal socketextending entirely through such cam member so as to be accessible at themiddle of the axial length of the cam and from both sides of the holder,said cam member having a central cam and having end bearings on oppositesides of said central cam.

7. A tool holder having a clamping means including a cam member having arotary bearin'gnear its end and having a cam face located inwardly ofsaid bearing, said cam member having a polygonal socket which isslightly flared to permit the easy insertion of a wrench head and tobring the wrench head to a bearing on a portion of the cam member withinthe rotary bearing of said member.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

GEORGE AMBORN. WVitnesses CHARLES 'B. HARRIS, WVILLIAM'G. COLE,

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G. I

